That train ticket purchasing macro I think is the "most Korean" of the bunch. When you are desperate to buy Chuseok train tickets, like every other sucker out there, let this macro handle the hassle of repeated clicking at just the right time when tickets go on sale. It will keep trying, and present you with a victorious trumpet blast if successful. You may recall Swing Browser, another Korean homegrown browser, had a similar feature.

Obviously not a whole lot here, and most are really just loading the mobile versions of sites in Whale's sidebar. But don't forget that Whale can also install Chrome extensions from the Chrome Store. Although vice-versa seems not true: I couldn't get Chrome to install these Whale extensions.

And if you feel like trying your hand at making your own Whale extensions, Naver's got you whale well covered. Check out their Whale extension development guide, and register to be a Whale Store developer, here:

By the way, Whale browser was supposed to be released in an English language version, but I haven't seen any further updates on that, and their former English landing page now 404s. So don't hold your breath.
And that was completely wrong. Whale is now released in English. See here.